diff --git a/lesson2.4_1.py b/lesson2.4_1.py
new file mode 100644
index 0000000..593b698
--- /dev/null
+++ b/lesson2.4_1.py
@@ -0,0 +1,8 @@
+'''****** Задание ********
+  *Таблица умножения.
+'''
+size = int(input())
+for row in range(1, size + 1):
+    for col in range(1, size + 1):
+        print(row * col, end=" ")
+    print()
\ No newline at end of file
diff --git a/lesson2.4_10.py b/lesson2.4_10.py
new file mode 100644
index 0000000..5623038
--- /dev/null
+++ b/lesson2.4_10.py
@@ -0,0 +1,8 @@
+'''****** Задание ********
+  *Мы делили апельсин.
+'''
+for a in range(1, (b := int(input())) - 1):
+    if a == 1:
+        print('А Б В')
+    for c in range(1, b - a):
+        print(f'{a} {c} {b - a - c}')
\ No newline at end of file
diff --git a/lesson2.4_11.py b/lesson2.4_11.py
new file mode 100644
index 0000000..52f33c6
--- /dev/null
+++ b/lesson2.4_11.py
@@ -0,0 +1,17 @@
+'''****** Задание ********
+  *Простая задача 3.0.
+'''
+count = 0
+for i in range(int(input())):
+    j = 2
+    if (n := int(input())) > 1:
+        count += 1
+        if n == 2:
+            count += 1
+        while n % j:
+            if j > n ** 0.5:
+                break
+            j += 1
+        else:
+            count -= 1
+print(count)
\ No newline at end of file
diff --git a/lesson2.4_12.py b/lesson2.4_12.py
new file mode 100644
index 0000000..68a8722
--- /dev/null
+++ b/lesson2.4_12.py
@@ -0,0 +1,11 @@
+'''****** Задание ********
+  *Числовой прямоугольник.
+'''
+m, n = int(input()), int(input())
+width = len(str(m * n))
+for i in range(1, m + 1):
+    for j in range(n * (i - 1) + 1, n * i + 1):
+        if j == n * i:
+            print(str(j).rjust(width, ' '))
+        else:
+            print(str(j).rjust(width, ' '), end=' ')
\ No newline at end of file
diff --git a/lesson2.4_13.py b/lesson2.4_13.py
new file mode 100644
index 0000000..40edbf0
--- /dev/null
+++ b/lesson2.4_13.py
@@ -0,0 +1,11 @@
+'''****** Задание ********
+  *Числовой прямоугольник 2.0.
+'''
+m, n = int(input()), int(input())
+width = len(str(m * n))
+for i in range(1, m + 1):
+    for j in range(i, i + m * (n - 1) + 1, m):
+        if j == i + m * (n - 1):
+            print(str(j).rjust(width, ' '))
+        else:
+            print(str(j).rjust(width, ' '), end=' ')
\ No newline at end of file
diff --git a/lesson2.4_14.py b/lesson2.4_14.py
new file mode 100644
index 0000000..7851efc
--- /dev/null
+++ b/lesson2.4_14.py
@@ -0,0 +1,18 @@
+'''****** Задание ********
+  *Числовая змейка.
+'''
+m, n = int(input()), int(input())
+width = len(str(m * n))
+for i in range(1, m + 1):
+    if i % 2:
+        for j in range(n * (i - 1) + 1, n * i + 1):
+            if j == n * i:
+                print(str(j).rjust(width, ' '))
+            else:
+                print(str(j).rjust(width, ' '), end=' ')
+    else:
+        for j in range(n * i, n * (i - 1), -1):
+            if j == n * (i - 1) + 1:
+                print(str(j).rjust(width, ' '))
+            else:
+                print(str(j).rjust(width, ' '), end=' ')
\ No newline at end of file
diff --git a/lesson2.4_15.py b/lesson2.4_15.py
new file mode 100644
index 0000000..7cdd296
--- /dev/null
+++ b/lesson2.4_15.py
@@ -0,0 +1,15 @@
+'''****** Задание ********
+  *Числовая змейка 2.0.
+'''
+m, n = int(input()), int(input())
+width = len(str(m * n))
+for i in range(1, m + 1):
+    for j in range(n):
+        if not j % 2 and j != n - 1:
+            print(str(i + 2 * m * (j // 2)).rjust(width, ' '), end=' ')
+        elif not j % 2 and j == n - 1:
+            print(str(i + 2 * m * (j // 2)).rjust(width, ' '))
+        elif j % 2 and j != n - 1:
+            print(str(2 * m * (j // 2 + 1) - (i - 1)).rjust(width, ' '), end=' ')
+        else:
+            print(str(2 * m * (j // 2 + 1) - (i - 1)).rjust(width, ' '))
\ No newline at end of file
diff --git a/lesson2.4_16.py b/lesson2.4_16.py
new file mode 100644
index 0000000..b5879b2
--- /dev/null
+++ b/lesson2.4_16.py
@@ -0,0 +1,12 @@
+'''****** Задание ********
+  *Редизайн таблицы умножения.
+'''
+m, n = int(input()), int(input())
+for i in range(1, m + 1):
+    for j in range(1, m + 1):
+        if j != m:
+            print(f'{(str(i * j) + " " if n % 2 else str(i * j)).center(n)}|', end='')
+        else:
+            print(f'{(str(i * j) + " " if n % 2 else str(i * j)).center(n)}')
+    if i * j != m * m:
+        print(f'{"-"* ((n + 1) * m - 1)}')
\ No newline at end of file
diff --git a/lesson2.4_17.py b/lesson2.4_17.py
new file mode 100644
index 0000000..2f21d45
--- /dev/null
+++ b/lesson2.4_17.py
@@ -0,0 +1,8 @@
+'''****** Задание ********
+  *А роза упала на лапу Азора 3.0.
+'''
+count = 0
+for _ in range(int(input())):
+    if (n := input()) == n[::-1]:
+        count += 1
+print(count)
\ No newline at end of file
diff --git a/lesson2.4_18.py b/lesson2.4_18.py
new file mode 100644
index 0000000..298250f
--- /dev/null
+++ b/lesson2.4_18.py
@@ -0,0 +1,17 @@
+'''****** Задание ********
+  *Новогоднее настроение 2.0.
+'''
+m, lengths = '', [0]
+for j in range(1, (x := int(input())) + 1):
+    m += str(j) + ' '
+    if j in (sum(range(i)) for i in range(j + 2)):
+        lengths.append(len(m) - 1)
+        m = ''
+lengths.append(len(m) - 1)
+n = 1
+for z in range(1, x + 1):
+    if z - 1 in (sum(range(i)) for i in range(z + 2)):
+        print(f"{' ' * ((max(lengths) - lengths[n]) // 2)}{z}", end=' ' if z != 1 else '\n')
+        n += 1
+    else:
+        print(z, end='\n' if z in (sum(range(i)) for i in range(z + 2)) else ' ')
\ No newline at end of file
diff --git a/lesson2.4_19.py b/lesson2.4_19.py
new file mode 100644
index 0000000..c86bde8
--- /dev/null
+++ b/lesson2.4_19.py
@@ -0,0 +1,9 @@
+'''****** Задание ********
+  *Числовой квадрат.
+'''
+n = int(input())
+m = len(str((n + 1) // 2))
+for i in range(n):
+    for j in range(n):
+        print(f'{min(i + 1, j + 1, n - i, n - j):>{m}}', end=' ')
+    print()
\ No newline at end of file
diff --git a/lesson2.4_2.py b/lesson2.4_2.py
new file mode 100644
index 0000000..2b37ea7
--- /dev/null
+++ b/lesson2.4_2.py
@@ -0,0 +1,7 @@
+'''****** Задание ********
+  *Не таблица умножения.
+'''
+size = int(input())
+for second in range(1, size + 1):
+    for first in range(1, size + 1):
+        print(f'{first} * {second} = {first * second}')
\ No newline at end of file
diff --git a/lesson2.4_20.py b/lesson2.4_20.py
new file mode 100644
index 0000000..2a24add
--- /dev/null
+++ b/lesson2.4_20.py
@@ -0,0 +1,16 @@
+'''****** Задание ********
+  *Математическая выгода.
+'''
+number = int(input())
+best_value = 0
+best_base = 0
+for base in range(10, 1, -1):
+    summa = 0
+    num = number
+    while num > 0:
+        summa += (num % base)
+        num //= base
+    if summa >= best_value:
+        best_value = summa
+        best_base = base
+print(best_base)
\ No newline at end of file
diff --git a/lesson2.4_3.py b/lesson2.4_3.py
new file mode 100644
index 0000000..d5bb42f
--- /dev/null
+++ b/lesson2.4_3.py
@@ -0,0 +1,14 @@
+'''****** Задание ********
+  *Новогоднее настроение.
+'''
+count = int(input())
+num = 1
+row = 2
+print(num)
+while num < count:
+    for i in range(1, row + 1):
+        if num + i <= count:
+            print(num + i, end=" ")
+    row += 1
+    print()
+    num = num + row - 1
diff --git a/lesson2.4_4.py b/lesson2.4_4.py
new file mode 100644
index 0000000..f4a7c9a
--- /dev/null
+++ b/lesson2.4_4.py
@@ -0,0 +1,7 @@
+'''****** Задание ********
+  *Суммарная сумма.
+'''
+summ = 0
+for _ in range(int(input())):
+    summ += sum(map(int, list(input())))
+print(summ)
\ No newline at end of file
diff --git a/lesson2.4_5.py b/lesson2.4_5.py
new file mode 100644
index 0000000..10e5aa9
--- /dev/null
+++ b/lesson2.4_5.py
@@ -0,0 +1,12 @@
+'''****** Задание ********
+  *Зайка — 5.
+'''
+counter, temp = 0, 0
+for _ in range(int(input())):
+    while (x := input()) != 'ВСЁ':
+        if x == 'зайка':
+            temp += 1
+    if temp:
+        counter += 1
+        temp = 0
+print(counter)
\ No newline at end of file
diff --git a/lesson2.4_6.py b/lesson2.4_6.py
new file mode 100644
index 0000000..2ba3056
--- /dev/null
+++ b/lesson2.4_6.py
@@ -0,0 +1,9 @@
+'''****** Задание ********
+  *НОД 2.0.
+'''
+n, a = int(input()), int(input())
+for _ in range(n - 1):
+    b = int(input())
+    while b:
+        a, b = b, a % b
+print(a)
\ No newline at end of file
diff --git a/lesson2.4_7.py b/lesson2.4_7.py
new file mode 100644
index 0000000..620f3d9
--- /dev/null
+++ b/lesson2.4_7.py
@@ -0,0 +1,7 @@
+'''****** Задание ********
+  *На старт! Внимание! Марш!
+'''
+for i in range(int(input())):
+    for j in range(3 + i, 0, -1):
+        print(f'До старта {j} секунд(ы)')
+    print(f'Старт {i + 1}!!!')
\ No newline at end of file
diff --git a/lesson2.4_8.py b/lesson2.4_8.py
new file mode 100644
index 0000000..490ad29
--- /dev/null
+++ b/lesson2.4_8.py
@@ -0,0 +1,9 @@
+'''****** Задание ********
+  *Максимальная сумма.
+'''
+name, summ = '', 0
+for _ in range(int(input())):
+    temp_name, temp_summ = input(), sum(map(int, input()))
+    if temp_summ >= summ:
+        name, summ = temp_name, temp_summ
+print(name)
\ No newline at end of file
diff --git a/lesson2.4_9.py b/lesson2.4_9.py
new file mode 100644
index 0000000..9aa5945
--- /dev/null
+++ b/lesson2.4_9.py
@@ -0,0 +1,7 @@
+'''****** Задание ********
+  *Большое число.
+'''
+number = ''
+for _ in range(int(input())):
+    number += max(input())
+print(number)
\ No newline at end of file